/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

#include "../../Application/jucer_Headers.h"
#include "../../Application/jucer_Application.h"
#include "jucer_ComponentLayoutEditor.h"
#include "../UI/jucer_JucerCommandIDs.h"
#include "../jucer_ObjectTypes.h"
#include "../Components/jucer_JucerComponentHandler.h"

//==============================================================================
class SubComponentHolderComp    : public Component
{
public:
    SubComponentHolderComp (JucerDocument& doc,
                            SnapGridPainter& g)
       : document (doc), grid (g),
         dontFillBackground (false)
    {
        setInterceptsMouseClicks (false, false);
        setWantsKeyboardFocus (false);
        setFocusContainerType (FocusContainerType::keyboardFocusContainer);
    }

    void paint (Graphics& g) override
    {
        if (! dontFillBackground)
        {
            if (PaintRoutine* const background = document.getPaintRoutine (0))
            {
                background->fillWithBackground (g, false);
                background->drawElements (g, getLocalBounds());

                grid.draw (g, background);
            }
            else
            {
                grid.draw (g, nullptr);
            }
        }
    }

    void resized() override
    {
        if (! getBounds().isEmpty())
        {
            int numTimesToTry = 10;

            while (--numTimesToTry >= 0)
            {
                bool anyCompsMoved = false;

                for (int i = 0; i < getNumChildComponents(); ++i)
                {
                    Component* comp = getChildComponent (i);

                    if (ComponentTypeHandler* const type = ComponentTypeHandler::getHandlerFor (*comp))
                    {
                        const Rectangle<int> newBounds (type->getComponentPosition (comp)
                                                          .getRectangle (getLocalBounds(),
                                                                         document.getComponentLayout()));

                        anyCompsMoved = anyCompsMoved || (comp->getBounds() != newBounds);
                        comp->setBounds (newBounds);
                    }
                }

                // repeat this loop until they've all stopped shuffling (might require a few
                // loops for all the relative positioned comps to settle down)
                if (! anyCompsMoved)
                    break;
            }
        }
    }

    void moved() override
    {
        ((ComponentLayoutEditor*) getParentComponent())->updateOverlayPositions();
    }

    JucerDocument& document;
    SnapGridPainter& grid;

    bool dontFillBackground;
};

//==============================================================================
ComponentLayoutEditor::ComponentLayoutEditor (JucerDocument& doc, ComponentLayout& cl)
    : document (doc), layout (cl), firstResize (true)
{
    setWantsKeyboardFocus (true);

    addAndMakeVisible (subCompHolder = new SubComponentHolderComp (document, grid));

    refreshAllComponents();

    setSize (document.getInitialWidth(),
             document.getInitialHeight());
}

ComponentLayoutEditor::~ComponentLayoutEditor()
{
    document.removeChangeListener (this);

    removeChildComponent (&lassoComp);
    deleteAllChildren();
}

//==============================================================================
void ComponentLayoutEditor::visibilityChanged()
{
    document.beginTransaction();

    if (isVisible())
    {
        refreshAllComponents();
        document.addChangeListener (this);
    }
    else
    {
        document.removeChangeListener (this);
    }
}

void ComponentLayoutEditor::changeListenerCallback (ChangeBroadcaster*)
{
    refreshAllComponents();
}

void ComponentLayoutEditor::paint (Graphics&)
{
}

void ComponentLayoutEditor::resized()
{
    if (firstResize && getWidth() > 0 && getHeight() > 0)
    {
        firstResize = false;
        refreshAllComponents();
    }

    subCompHolder->setBounds (getComponentArea());
    updateOverlayPositions();
}

Rectangle<int> ComponentLayoutEditor::getComponentArea() const
{
    const int editorEdgeGap = 4;

    if (document.isFixedSize())
        return Rectangle<int> ((getWidth() - document.getInitialWidth()) / 2,
                               (getHeight() - document.getInitialHeight()) / 2,
                               document.getInitialWidth(),
                               document.getInitialHeight());

    return Rectangle<int> (editorEdgeGap, editorEdgeGap,
                           getWidth() - editorEdgeGap * 2,
                           getHeight() - editorEdgeGap * 2);
}

Image ComponentLayoutEditor::createComponentLayerSnapshot() const
{
    ((SubComponentHolderComp*) subCompHolder)->dontFillBackground = true;
    Image im = subCompHolder->createComponentSnapshot (Rectangle<int> (0, 0, subCompHolder->getWidth(), subCompHolder->getHeight()));
    ((SubComponentHolderComp*) subCompHolder)->dontFillBackground = false;

    return im;
}

void ComponentLayoutEditor::updateOverlayPositions()
{
    for (int i = getNumChildComponents(); --i >= 0;)
        if (ComponentOverlayComponent* const overlay = dynamic_cast<ComponentOverlayComponent*> (getChildComponent (i)))
            overlay->updateBoundsToMatchTarget();
}

void ComponentLayoutEditor::refreshAllComponents()
{
    for (int i = getNumChildComponents(); --i >= 0;)
    {
        std::unique_ptr<ComponentOverlayComponent> overlay (dynamic_cast<ComponentOverlayComponent*> (getChildComponent (i)));

        if (overlay != nullptr && layout.containsComponent (overlay->target))
            overlay.release();
    }

    for (int i = subCompHolder->getNumChildComponents(); --i >= 0;)
    {
        Component* const comp = subCompHolder->getChildComponent (i);

        if (! layout.containsComponent (comp))
            subCompHolder->removeChildComponent (comp);
    }

    Component* lastComp = nullptr;
    Component* lastOverlay = nullptr;

    for (int i = layout.getNumComponents(); --i >= 0;)
    {
        auto c = layout.getComponent (i);
        jassert (c != nullptr);

        auto overlay = getOverlayCompFor (c);

        bool isNewOverlay = false;

        if (overlay == nullptr)
        {
            auto handler = ComponentTypeHandler::getHandlerFor (*c);
            jassert (handler != nullptr);

            overlay = handler->createOverlayComponent (c, layout);

            addAndMakeVisible (overlay);
            isNewOverlay = true;
        }

        if (lastOverlay != nullptr)
            overlay->toBehind (lastOverlay);
        else
            overlay->toFront (false);

        lastOverlay = overlay;

        subCompHolder->addAndMakeVisible (c);

        if (lastComp != nullptr)
            c->toBehind (lastComp);
        else
            c->toFront (false);

        lastComp = c;

        c->setWantsKeyboardFocus (false);
        c->setFocusContainerType (FocusContainerType::keyboardFocusContainer);

        if (isNewOverlay)
            overlay->updateBoundsToMatchTarget();
    }

    if (grid.updateFromDesign (document))
        subCompHolder->repaint();

    subCompHolder->setBounds (getComponentArea());
    subCompHolder->resized();
}

void ComponentLayoutEditor::mouseDown (const MouseEvent& e)
{
    if (e.mods.isPopupMenu())
    {
        auto commandManager = &ProjucerApplication::getCommandManager();

        PopupMenu m;

        m.addCommandItem (commandManager, JucerCommandIDs::editCompLayout);
        m.addCommandItem (commandManager, JucerCommandIDs::editCompGraphics);
        m.addSeparator();

        for (int i = 0; i < ObjectTypes::numComponentTypes; ++i)
            m.addCommandItem (commandManager, JucerCommandIDs::newComponentBase + i);

        m.showMenuAsync (PopupMenu::Options());
    }
    else
    {
        addChildComponent (lassoComp);
        lassoComp.beginLasso (e, this);
    }
}

void ComponentLayoutEditor::mouseDrag (const MouseEvent& e)
{
    lassoComp.toFront (false);
    lassoComp.dragLasso (e);
}

void ComponentLayoutEditor::mouseUp (const MouseEvent& e)
{
    lassoComp.endLasso();
    removeChildComponent (&lassoComp);

    if (! (e.mouseWasDraggedSinceMouseDown() || e.mods.isAnyModifierKeyDown()))
        layout.getSelectedSet().deselectAll();
}

static void moveOrStretch (ComponentLayout& layout, int x, int y, bool snap, bool stretch)
{
    if (stretch)
        layout.stretchSelectedComps (x, y, snap);
    else
        layout.moveSelectedComps (x, y, snap);
}

bool ComponentLayoutEditor::keyPressed (const KeyPress& key)
{
    const bool snap = key.getModifiers().isAltDown();
    const bool stretch = key.getModifiers().isShiftDown();

    const int amount = snap ? document.getSnappingGridSize() + 1
                            : 1;

    if (key.isKeyCode (KeyPress::rightKey))
    {
        moveOrStretch (layout, amount, 0, snap, stretch);
    }
    else if (key.isKeyCode (KeyPress::downKey))
    {
        moveOrStretch (layout, 0,amount, snap, stretch);
    }
    else if (key.isKeyCode (KeyPress::leftKey))
    {
        moveOrStretch (layout, -amount, 0, snap, stretch);
    }
    else if (key.isKeyCode (KeyPress::upKey))
    {
        moveOrStretch (layout, 0, -amount, snap, stretch);
    }
    else
    {
        return false;
    }

    return true;
}

bool ComponentLayoutEditor::isInterestedInFileDrag (const StringArray& filenames)
{
    const File f (filenames [0]);
    return f.hasFileExtension (cppFileExtensions);
}

void ComponentLayoutEditor::filesDropped (const StringArray& filenames, int x, int y)
{
    const File f (filenames [0]);

    if (JucerDocument::isValidJucerCppFile (f))
    {
        JucerComponentHandler jucerDocHandler;
        layout.getDocument()->beginTransaction();

        if (TestComponent* newOne = dynamic_cast<TestComponent*> (layout.addNewComponent (&jucerDocHandler,
                                                                                          x - subCompHolder->getX(),
                                                                                          y - subCompHolder->getY())))
        {
            JucerComponentHandler::setJucerComponentFile (*layout.getDocument(), newOne,
                                                          f.getRelativePathFrom (document.getCppFile().getParentDirectory()));
            layout.getSelectedSet().selectOnly (newOne);
        }

        layout.getDocument()->beginTransaction();
    }
}

bool ComponentLayoutEditor::isInterestedInDragSource (const SourceDetails& dragSourceDetails)
{
    if (dragSourceDetails.description != projectItemDragType)
        return false;

    OwnedArray<Project::Item> selectedNodes;
    ProjectContentComponent::getSelectedProjectItemsBeingDragged (dragSourceDetails, selectedNodes);

    return selectedNodes.size() > 0;
}

void ComponentLayoutEditor::itemDropped (const SourceDetails& dragSourceDetails)
{
    OwnedArray<Project::Item> selectedNodes;
    ProjectContentComponent::getSelectedProjectItemsBeingDragged (dragSourceDetails, selectedNodes);

    StringArray filenames;

    for (int i = 0; i < selectedNodes.size(); ++i)
        if (selectedNodes.getUnchecked (i)->getFile().hasFileExtension (cppFileExtensions))
            filenames.add (selectedNodes.getUnchecked (i)->getFile().getFullPathName());

    filesDropped (filenames, dragSourceDetails.localPosition.x, dragSourceDetails.localPosition.y);
}

ComponentOverlayComponent* ComponentLayoutEditor::getOverlayCompFor (Component* compToFind) const
{
    for (int i = getNumChildComponents(); --i >= 0;)
    {
        if (ComponentOverlayComponent* const overlay = dynamic_cast<ComponentOverlayComponent*> (getChildComponent (i)))
            if (overlay->target == compToFind)
                return overlay;
    }

    return nullptr;
}

void ComponentLayoutEditor::findLassoItemsInArea (Array <Component*>& results, const Rectangle<int>& area)
{
    const Rectangle<int> lasso (area - subCompHolder->getPosition());

    for (int i = 0; i < subCompHolder->getNumChildComponents(); ++i)
    {
        Component* c = subCompHolder->getChildComponent (i);

        if (c->getBounds().intersects (lasso))
            results.add (c);
    }
}

SelectedItemSet <Component*>& ComponentLayoutEditor::getLassoSelection()
{
    return layout.getSelectedSet();
}
